Alarm system



D. J. D] BONA ALARM SYSTEM Filed Sept. 29, 1932 2 Sheets-Sheet lfianzezza'eri' a7 16.30720 M 1 By Wm flllorney D.. J. Dl BONA April 24,1934.

ALARM SYSTEM Filed Sept. 29, 1952 2 Sheets-Sheet 2 r 0 I. n B M IPatented Apr. 24, 1934 1 Claim.

This invention appertains to new and useful improvements in alarmsystems, and more particularly to an alarm system for automobiles, andthe same is an improvement on my co-pending application Serial No.627,269, filed August 2, 1932, with the same title.

The principal object of the present invention over my above co-pendingapplication is to provide an alarm system especially adapted for use ontaxicabs, wherein when the seat switches are closed without setting theflag of the meter to operating position, the ignition system of thevehicle will be shut ofi.

Other important objects and advantages of the invention will becomeapparent to the reader of the following specification.

In the drawings:-

Figure 1 represents a diagrammatic view or" the system with the seat andbrake switches in open position.

Fig. 2 represents a diagrammatic view of the system with one of the seatswitches closed, and with the meter switch open.

Referring to the-drawings wherein like numerals designate like parts, itcan be seen that numeral 5 represents the usual storage battery fromwhich extends a conductor 6 to the ignition switch 7. Jumper 8 extendsfrom the ignition switch 7 to the contact 9 of the electro-magneticshut-off device generally referred to by numeral 18. Numeral 11represents the companion con tact to the contact 9 from which extendsthe wire 12 to the distributor l3.

Extending from the lead wire 6 is the wire 14 connecting to the seatswitches generally referred to by numeral 15. Each of these switchesconsists of a stationary contact 16 and a seat operated plunger contact17.

A common wire 18 extends from the plunger contact 17 to the plungercontact 19 of the meter flag operative switch 20. Numeral 21 representsthe meter box and numeral 22 represents the usual meter flag which setsthe meter in operation when in lowered position.

This switch 26 is specifically set forth in my co-pending application,Serial No. 627,269 aforementioned.

Numeral 23 represents a di-electric extension on the plunger 19operating through an opening in the stationary contact 24, from whichextends the conductor 25 connecting to one side of the electro-magnetcoil 26 of the magnetic unit 10. The switch 20 has a spring associatedwith the plunger contact 19 for normally maintaining the same engagedwith the stationary contact 24 as shown in Fig. 1. Thus, the switch 20is a normally closed switch and is only opened when the flag 22 isdropped upon the di-electric extension 28 of the plunger contact 19.

Extending from the coil 26 is the wire 27 connected to one side of theannunciator or horn 28 and from the opposite side of this horn 28extends a jumper 29 which connects to the shell 30 of the contactplunger 31 (the latter being in sliding contact therewith) of thebrake-operated switch generally referred to by numeral 31. Of thisswitch 31, numeral 32 represents a stationary contact and from thiscontact 32 extends the condoctor 33 which is connected to the battery 5.

A spring 34 exerts its tension on the armature and contactor 35 so as tonormally maintain the same bridging the contacts 9 and 11 when the coil26 is de-energized.

It can now be seen by referring to Fig. 1, that when the vehicle isstanding idle the seat switches and the brake switch 31 are openalthough the motor may be operating. When a passenger gets into the caband sits upon one of the seats, the corresponding switch 15 is closedwhich permits current to flow from the battery 5 through the particularswitch 15 to the switch on the meter 21. II the vehicle is stationarywith the brake part and the switch 31 open, of course the particularcircuit will be opened and there will be no energization of the alarm28. However, if the brake is released so that the switch 31 closes, thencurrent will flow by way of the conductor through the coil 26 and horn28, and by way of the switch 31 to the battery 5. This will not onlyresult in the sounding of the alarm 28, but the energization of the coil26 will attract the armature and contactor to break the connectionbetween the contacts 9-l1 or the ignition system.

However, if the flag 22 is thrown downwardly to the position shown inFig. 2 while one of the seat switches is closed, then the switch 20 willbe opened, so that no current can flow therethrough to reach the coil 26or horn 28, although, the switch 31 of the brake will be in closedposition so that the vehicle can move with its brake released.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, sizeand materials may be resorted to without departing from the spirit andscope of the invention as claimed hereinafter.

Having thus described my invention, what I claim as new is:

In a taximeter vehicle, the combination with opening said secondnormally closed switch by the lowering of the handle of the register anda brake switch in the alarm circuit between the source of energy and themagnetic means, said brake switch being opened when the br al es areapplied and closed when the brakes are released.

DOMENICK JOHN DI BONA.

